Alloy 28 Tubing ASTM B668 / ASME SB668 Supplier, Manufacturer

Alloy 28 Tubing: Precision-Engineered for Corrosive Applications

Alloy 28 Tubing, also known by its UNS designation N08028, is a high-alloy austenitic stainless steel developed specifically to withstand extreme corrosion in both acidic and alkaline environments. Its composition, enriched with nickel, chromium, and molybdenum, provides excellent resistance to stress corrosion cracking, pitting, and oxidation at elevated temperatures. This makes Alloy 28 Tubing highly suitable for demanding applications in industries such as chemical processing, oil & gas, and pollution control, where performance and longevity are critical.

Originally designed for use in phosphoric acid production, Alloy 28 Tubing continues to prove its versatility and reliability across a wide range of corrosive services. Its superior weldability, combined with its mechanical integrity under pressure and heat, allows manufacturers and engineers to use it confidently in the fabrication of heat exchangers, evaporators, and downhole equipment. With compliance to standards like ASTM B668 and ASME SB668, Alloy 28 Tubing has become a trusted choice for environments that demand both durability and resistance to aggressive media.

Alloy 28 Tubes – Seamless & Welded Tubing

Solitaire Overseas offers a premium range of Alloy 28 Tubes, manufactured as per ASTM B668 and ASME SB668 standards. Available in seamless, welded, and ERW forms, these tubes are engineered from UNS N08028 / WNR 1.4563, delivering exceptional corrosion resistance in both acidic and caustic environments. Whether you require Alloy 28 Seamless Tubes, Welded Tubes, or specialized ERW options, each product is designed to withstand high temperatures and aggressive media.

Recognized as a reliable exporter of Alloy 28 Tubing in India, Solitaire Overseas serves industries such as chemical processing, pharmaceuticals, pulp & paper, and nuclear energy. Our Alloy 28 Tubing solutions include round tubes, square tubes, and custom-fabricated variants tailored to client specifications. With superior resistance to stress corrosion cracking and pitting, along with excellent weldability and mechanical stability, our tubing ensures performance in the most challenging operational environments.

Solitaire Overseas is one of the reputed manufacturer, exporter, and supplier of Alloy 28 Tubes that make use of high and top-notch quality raw material for making these tubes. The material they use is properly inspected and checked by the manufacturers as well as qualified inspection professionals. In addition to this, these tubes are made into accurate shape and size with the help of advanced technology and modern tools.

These tubes reveal various amazing features as well as properties that make tubes a high-quality product. The features include corrosion resistance, oxidation resistance, pitting cracking resistance, high tensile strength, durability, workability, weldability, and long service and functional life.

These are the two important processes done by the manufacturers in order to check the quality of the tubes. The tubes are well inspected and tested by the inspection agencies that in turn offer customers with test certificates and other product-related documentation. The entire testing process takes place under the scrutiny and leadership of experts that ensure each and every product is perfect and made as per the demand of clients and customers.

The tests include flaring test, flattening test, visual inspection, radiography test, ultrasonic test, pitting resistance test, (PMI) or positive material identification test, and IGC test. After the testing process, Alloy 28 Tubes are packed in waterproof quality of packaging material that helps avoid rust and other unconditional damages at the time of delivery.

Specification

Specifications

ASTM B668 / ASME SB668

Dimensions

ASTM, ASME and API

Seamless Tube Size

1/2" OD - 12" OD

Welded Tubes Range

1/2" OD - 12" OD, Guage: 25 SWG - 10 SWG

Outside Diameter :

.00 mm OD up to 914.4 mm OD

Length :

Single Random, Double Random & Required Length

Thickness

0.3mm – 50 mm

Schedule

SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS

Type

Seamless, Welded, ERW

Form

Round Tubes, Square Tubes, Rectangular Tube

Alloy 28 Tubes Equivalent Grades

STANDARD	WERKSTOFF NR.	UNS	EN	AFNOR
Alloy 28	1.4563	N08028	X1NiCrMo31-27-4	Z1NCDU31-27-03

SS Alloy 28 Tubes Chemical Composition

Element	Alloy 28
C	0.020 max
Si	0.6 max
Mn	2.0 max
P	0.025 max
S	0.010 max
Cr	27.00
Ni	31.00
Mo	3.5
Cu	1.0

Alloy 28 Tubes Mechanical & Physical Properties

Element	Alloy 28
Tensile Strength	500-750
Yield Strength (0.2%Offset)	220
Elongation	35 %
Hardness	230

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Alloy 28 Tube Application

SS Alloy 28 Tubes in various Application Industries

Food Processing Industry

Fabrication Industry

Oil and Gas Industry

Chemical Industry

Plumbing

General Purpose Applications

Heating

Water Supply Systems

Power Plant

Paper & Pulp Industry

FAQ For Alloy 28 Tubes

What is alloy 28 material?

Alloy 28 is a high-alloy austenitic stainless steel designed for excellent resistance to corrosion in strong acids, including sulfuric and phosphoric acids. It contains nickel, chromium, and molybdenum, offering superior performance in aggressive and chloride-rich environments.

What material is N08028?

UNS N08028 refers to Alloy 28, a nickel-iron-chromium alloy with molybdenum and copper. It provides exceptional resistance to corrosion in both oxidizing and reducing acids, making it suitable for chemical processing, seawater handling, and pollution control equipment.

What is Sanicro 28 made of?

Sanicro 28 is composed of 31% nickel, 27% chromium, 3.5% molybdenum, and small amounts of copper, with iron as the base. This composition delivers outstanding resistance to stress corrosion cracking and pitting in acidic and high-chloride environments.

What is alloy 88 equivalent to?

Alloy 88 typically refers to a high-nickel alloy used in electrical or resistance applications. While not standardized like Alloy 28, it may be functionally compared to other nickel-chromium alloys, though exact equivalents depend on its application and composition.

Why is it called alloy?

A material is called an "alloy" when it consists of two or more metals—or a metal and non-metal—combined to improve properties like strength, corrosion resistance, or hardness. The name signifies its engineered nature to outperform pure metal elements in specific applications.